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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13e6a9348b9082287acbdaff16ca2bdfd1599f10b895367db4a3f4a04e423f8' 
  AND token = 'M27dzQLKEEXgfRR2TJC5MF2L2MGFfYEuupz60X3RIGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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