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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8d495f6a590507437ffceb660c9850d6630307c129ff5e13b3c6d6f219c692' 
  AND token = '7pdc44PlM5u4gh+MPSxdr4bybux/0RsXZAyYPm3eJaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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