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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8929039de72881d4ae96890d8ad05e13795bd8bbfb19e06ed4934ce98e2be4e6' 
  AND token = 't8/lWoMt2FvTCJMRQ8QXFs8ovGer82me9yMZmQ9jMcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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