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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b1984652d3ef460b3e1f1fb8ea7f9e6ea1e524a9153a56347e451b0dde40af5' 
  AND token = 'lt5O0U2pSeulUb6s0M3SYbjiQYW+weZqR62i1wNPAXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00267

JSON explain

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