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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7301b52e8808ab666f1b1058226466c1f373fbab64ecc34a519a876bf3e6a5f7' 
  AND token = '2gKSfbrx4O87IC7yIk0x43X+3AT3TAQ9fV8nBxJrSt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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