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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47bd5bce2e1db3c811b8ce84edaead739c6cc0b2d059e2e529a130e988508b80' 
  AND token = 'Rg2QilrzJ+SaP5vLoWeG1+htpZlpyY4f3okkP7APyZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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