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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9cc803c0c6b6fd32bff3921c89362dc82b9f8d0bc81755c1d1a76d666cccea' 
  AND token = 'ex3aKJHmqVab6AjOuTE/Wssmn6Fr6jICLK6Eq62UT1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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