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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb11dd6d0cfba0b5f2c0fe3abf6c3ff5ea83f84e8caf38b1dad51a865cbda0e7' 
  AND token = 'idhT4+ns/lcZjQfT44RiWoQYC+3f+khkVouV25IylZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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