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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09f09c0e09d4ff167601f64ab6ac820f916e6c7f5769596dfafd3a85db90ae9' 
  AND token = 'YyPB/SXXpV8goKY7wWnMyXOKty/x52uO7qASnnrMdrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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