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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd74be445c0ebb0301f58c4f882abd074ff0b8d5de83f05fc0357baed4787be8f' 
  AND token = 'zEwhZsM7zqqAxq3Y5p/Zl4sZq32ScMLsJLptin68j/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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