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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc2f7e072f8529856194bb83e08319ff0c90902fb04e47c17bb951e2b3b44ec' 
  AND token = 'unbpHJjV982h0FQNEqN2E4d3VLAdSciqBv51kzzn+P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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