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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6911ebe7e06dccd1df7cb0b6b234bab066e0b55fe7e0bb7362eada5558256e' 
  AND token = 'myL5NnFzFQgNhh891dWKpPieyRONLAMubtPnrrt0gKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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