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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdc15831497320df623ff32c001af26e500747e3b9f2b1787cbc2262939e08aa' 
  AND token = '/9hFR0T1SFBsNv2TWMmQXa6oEHPtMs4MGGSAPqBVy94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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