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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9720236dcdd19baed06422c2fb32e5d9b18743b87594feadee908b2cef841e3' 
  AND token = '20VU3qmni4oEPHqOad9u6n63Rotzyq3YzLY5aRo9plE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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