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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6694cadeb1d8eb05c7a19cdad16e5a90412d8594fc409fc4984535fda8745a75' 
  AND token = 'P5bzDwwvyGeWsqqoQXI4nVGmxXcg6cYj1cwJe0lZE3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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