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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1c4bd6f2966a9536143606c5e1e873a8ab09c7dca28f33938650c284863dc8' 
  AND token = 'vkpL0Hl5x6+6W09tEQpBfCLmKzq7siuw7Yd73//R+tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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