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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53fa8b6b7787f5a65faa0f70c46e699bef0b8fc22bd6197f1c88890e9f631889' 
  AND token = 'AXimsaVMm5KNM9fg3ecq071KKW3R8hY629Vepcm04BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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