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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2044b83d4b79000d77b5c6d64150fee7891b6b70feeb1fcaf8cccec8de7e352' 
  AND token = '9Ab4bDxwzmyGN8B1+/9TnkkPxS41DAiJoqJr61gN+Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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