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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a038c9e884dece98d08448505f2319f13f0a9de9ea47b14a34780a7c968e50f3' 
  AND token = 'WxYD4ZjjkfPM6bGScsn1A2OHivQcsIRqsXjqnZg08Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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