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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1a56c664743c313506ef6adccad9a91227899c4d4aa24622c2d12b56aaa9258' 
  AND token = 'f2e5ANYBYzwYTnlIObAqDw/H9AaYJsgW9htmrc49a0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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