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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3762223149e4fd4b719d90cf9307743fd9f5ae633d2d8edafd0e2158250c41ff' 
  AND token = '0C7S9jyRplirlmro3DpsKw3GHNay7NYR0YdsoODg+Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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