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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54acdb9ab9dd2f06ff7a6e1ba2010f5ae545339ec1ef487111c97648b12b077' 
  AND token = 'zinOm7MGPq5WkhrYSJ7tquzWcwXJ9tRXNlIX7c/Ckwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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