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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24be58caaa611c78ac6d8b2e4b4d8add7d69d2378e7934baa45ad0683391c25a' 
  AND token = 'FqC2rDsknMO38nmNhQ4rrscmNOW0WOEf4mqfM5SNpgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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