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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b1ee26a971de3cc9ea14f6f6140af1129cd59e78a81b1706ee2ce80609b797' 
  AND token = '91qbCX51+3g6yukt9XnyY26j5QlPSjK86U9gSvNmkhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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