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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b58696b4038db191c8e5cdc4ba928aa3443da601970894cbc4a6be7028f3934' 
  AND token = 'xfcSeJmFovVJDSegIfMLMC6cixemX6Pj8UOWjSw+GcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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