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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf2c0546e4194eade8272408f585d8bd45752b57844829d0cb8487416cc8775' 
  AND token = 'h8Qc9ZksjM5qopwA5pTyixEV1HqQaH7ljlo20Wczkk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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