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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf4c9a4630770b603ac8e237f02219f8fdaa4abd21a9dd469760fd922b4969a' 
  AND token = '4XPrJpyycIzlMe9RzgDs7j+OIX26g54Gb1Own3nRnX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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