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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16f160faacee7e03f475773962dc31bb74d8d2098bbe8c1bf43278b1d8efaaa5' 
  AND token = 'R188pKMWHbvug7N2lRQZpyd8fWBM51KC6Dcu3EknT1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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