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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f4406ae2baccaa47d6299e15fdd8cf830ebd13e7e084de73e45b34360e762b9' 
  AND token = 'avm6uc6rogrVV0oFvuv7llFQcMC88vBpprIQYIZZMBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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