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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b89532c50dddd2ed697621d56a4bdfc657b7ba7e3b9ef37f31a1bfd304073b' 
  AND token = '8WiIe6zprw0UwipxkdOjyaG4Q0Pk/kpI+1Srafky/i4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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