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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ac5d3896058b26ab94f1203614f0d9c1c5f3c5e2656b26fe96bdf68c0500b2' 
  AND token = 'jDpDDpq0pADsIUnmDUpWEvWN3KQ+UpTA7vapTYP8FCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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