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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534726e17ae37d77fb430a4e77e24e829db704155e0e266f8b8ae02c94eb2cdb' 
  AND token = '9Bkvgq3FMNcSDl07F7n5Lg9D2wZPAcHX6iEA+KnWWOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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