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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1100c1aa43750cac17d4719db9d1294ef99f1c879fd0968f701476cd2652d5b' 
  AND token = 'Z7OK/1tOomOriUxAO7MytM7g+ikJfNVZRdtY/yb+4rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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