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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba60fcd405f8df6d04bbad37c89f17ed2a0aed6a2786ea075357e0727a2c5303' 
  AND token = 'c8LVPVXZWN2/8dkQ8EBx2bfslAk5rrfoas/akT5ImeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}