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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f8d98a7af543605969a5f806a6b57acacd21d80ef825bd0a64a390f37cebf9' 
  AND token = 'q516AQ44jL2bZiQ/5FKaFTJ6yS/SaKrO5p/RlD47ezc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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