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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5497a25631375c8eee3c3fae362c3a050e7eeec953f32a7fa393b8ecc58249a3' 
  AND token = 'f5bCdfGEZQePQSNrGH39bqwp0VEew7NDHY6w8gzSwVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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