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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e815041aa983a9c2756b72fe0d83481898dacc7ea2c42f6a1eb5a45847d4bc' 
  AND token = '80kPDdYutwRg99vaLlqsEzUqfOyTHUJSRuUjZaJ3GoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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