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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c805f83b194e2c3dfe1a625d0ab2ae99efa6d7e2ad84587b0d51d682e4da58' 
  AND token = 'Rvo3TYuLeq9yvW5UQf1D9aU1HMTJ29k36DcB5mOLVeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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