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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b32b5d63cfb309c29ea529adfcc50c248beca8a42212ae8c8c5b06b7bcd5ff' 
  AND token = '21BOlyD4dCDzPAbP60LMyebldGD8dr44Zz1V0V0JQxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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