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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552f15882925d3e3cb6035bdb348d481ea1abaf5fc78b81bbdaa9199a8abadbc' 
  AND token = 'jbHn/9RxMbRbDE7feeKpjocKbvDmvzHWSlVADLWmQbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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