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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d6b79e7886224364397f8e406f9b3a68380807c51df2014f951d5332565a83' 
  AND token = 'S0j4TNwnOsFfgqEpyQKNMEUuOHjjXSTh7RC6IxgMTOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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