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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d35d79ff100eaab4afa95a306cd70739dfdac91ba98f7e0d2755adbbfcd0dd' 
  AND token = 'M+8k4Vhiy98Y67SarFLljVYlN+p5oPGkR83GyvU1g7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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