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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a494700292a2afdaea60750f59969d40da04c0ae8669db7186e34133b5aa6b24' 
  AND token = 'QZo+AbXtEgZfLewdjnxYd/egIcGneKZlRUA9N9E8mHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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