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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c7b819bba95ccdf39b250c1af9939c53fdfc5354d6c6425fa084f94bd70265' 
  AND token = 'wjV7i1ZIMPrgBjKkJVHqrmdHaVkdJA/0Jg9mFrlodec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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