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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c82d458e49d82f6cb7d95b349e4a7b252cbe27ab5d12580010931494f8a2a6' 
  AND token = 'xE8Nz3DC7EtU72RjlblTfy3bemeByj7ZUF7ECF3mbwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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