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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c07e8826cada28453eddbd634a9926e33c1df7e02765510f75739702b08ab7' 
  AND token = 'IH7sNPFFpV1Ek79IA1nRZbm5KL7T/O09+IFYr9I3JxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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