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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ab8392f160ddb7ed08ad18fbe559092b3ffa3ce88cfdcf28a4e64ba164ea7a7' 
  AND token = '0at5cgISLpXIabRCaXYf5b8hsv9Ea6UvMSnRLbkDc3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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