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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e070ba73bbc036f33bd09978d030933b114cdde2a434043e4ccb4ee06b9f32f' 
  AND token = 'jICMywwn7AsBxpa/LpvtfNTJgpRfiFLCjUmQcF0kr7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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