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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16dc3258e3f7b6cc115d9d18e6bce7b2aa15d52d4289d390ee96ec9d77b6aca5' 
  AND token = 'N90bdCojc0R1y/3NA7WnZKIvgQc3xtdGmjiQ6reWJj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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