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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be458008f0513582cc7df2d8904739e0b0f72ccbc767e88c172a3f9c9b58d2da' 
  AND token = '9bwT2CrEc0kwA4JtLNtckYXB4PFaC4U4fgeJSaWu+rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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