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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ba29edc26d1e3058770b28dd51ebfefedc5bbecca76ef084911df94b6ed830' 
  AND token = 'g/0OBKR8QkMcy8Bi+NT0iJ6jPPFaMzBJLzFfitYf4Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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