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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6aaee272171d3010cd7e04af8b8b58f486f6d7cfb02a040a7112a67e7541f0' 
  AND token = 'Dys4RWE9Y6As28Hpqp5EB1qj8DSfL6iDF2UF3s3l+Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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