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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '630213bd096204e26e321d91d3cdb1e20362b9c08b8177fcaac28ba9b0b4804b' 
  AND token = 'LXmeOkeonzZn1fEy2XZAsjYeS0YPXAWBJ+ijmHbFz1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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