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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5409abc15fe04b9d151373932cd33c6e6b46cd56c47540ee48847b4a1ca05f30' 
  AND token = 'CP77n5OpBTuqUvqif9F52NiNSP7KW3TGVP2vKojzyqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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