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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9d09b8fb1566947628b0fed33fb9ecb05cfa85ad49c2aed6e761b2fbeef9f5' 
  AND token = 'ja0Jcy9ufQrRkbhyooYEZgYKOJAOZX0eMi1M5E5MTPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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