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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47a5b5e87966ab95d160d481688be5b2b068c88c2104c1305baa0e52041a2da3' 
  AND token = 'FDa7rWm459Mi8pJ77j12qSRhco40LxZdSpoAKm+ORDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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