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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd6836d343b90d6e451c0b20aff9bdf4b20d380b983ceb151f2e5c61f0e94f0' 
  AND token = 'a2DPp5oLI5jCzOvuoTzAbn6v5IfGAgSAImdv5q29kWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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