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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e95d2f5c179faa4484ed6d162e89dacd680b27078ce3e2fac0eece62a9d09698' 
  AND token = 'RWABjArHy0sM13xB/fDjYTloE0GYHHFu5g9hhYf/l1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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