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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac8c0a5be6a1ee9c4b5f80519ff4261d2a6f4c19d3442a8804c47827ea4c380' 
  AND token = 'oxx17l0AX2AiNqpE8XKIm+E22j/WYvrDaTsXMDLUr3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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